"You make yourself [...] look different. [...] You cannot change your creature type (although you can appear as another subtype)
Two sub questions:
- Is a Monstrous Humanoid a humanoid subtype? If so since the Medusa (a monstrous humanoid) has serpentile hair, this should work.
If not, there's a "Humanoid(reptilian)" subtype.
- Could the witch make different parts of herself appear as different subtypes (i.e. face elf-like, hair reptilian subtype)?